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ethereum-nginx-proxy

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Lua script for access control with nginx on top of Ethereum JSON-RPC

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Ethereum Nginx Proxy
====================

This repo allows exposing a Ethereum JSON-RPC server to remote hosts using nginx as a reverse proxy.
For security purpose, an Ethereum client (geth, parity, ...) exposes the JSON-RPC service only to localhost interface. In some cases (permisionned chain by example), it can be interesting to expose JSON-RPC to remote hosts but with limited access.

This solution is to use a LUA script, used with nginx-lua-module to control access to the upstream Ethereum client. You can blacklist or whitelist certain JSON-RPC methods (for example, authorize only JSON-RPC requests to `eth_sendRawTransaction` to allow remote hosts to send transactions to the client, without allowing them to read states in the chain).

Why nginx?
----------

nginx has some interesting characteristics as a reverse proxy on top of Ethereum JSON-RPC service:

* Can expose the JSON-RPC service through a TLS channel
* Can load balance between multiple JSON-RPC backends
* Can forward HTTP incoming traffic to the IPC interface of Ethereum client
* Can plug standard authentication on top of the JSON-RPC interface (basic authentication, TLS mutual authentication, ...)

Installation
------------

The script `eth-jsonrpc-access.lua` must be put in your nginx, to be used from `access_by_lua_file` directive. 
In order to have a fully functional nginx proxy, you have to install:

* lua-nginx-module, see the setup [here](https://github.com/openresty/lua-nginx-module#installation).
* cjson lua package installed, see [here](https://www.kyne.com.au/~mark/software/lua-cjson.php)

Or you can use an adapt the provided Docker image (see [Docker image section](#docker-image)).

Usage
-----

The lua script must be used in a `location` nginx using the `access_by_lua_file` directive.

You have to set one of `jsonrpc_whitelist` or `jsonrpc_blacklist` nginx variable to restrict the list of JSON-RPC methods available for this location, separated by commas:

```
location / {
  set $jsonrpc_whitelist 'eth_getTransactionByHash,eth_getTransactionReceipt,eth_sendRawTransaction';
  access_by_lua_file 'eth-jsonrpc-access.lua';
  proxy_pass http://localhost:8545;
}
```

With the configuration above, only `eth_getTransactionByHash`, `eth_getTransactionReceipt`, `eth_sendRawTransaction` calls will be fowarded to JSON-RPC interface at `http://localhost:8545`, other requests will be rejected with HTTP 403 status.

You can find a full `nginx.conf` example file in the repo.

Docker image
------------

A ready to use image is published to Docker Hub.

Pull the image:  
`docker pull antoine/ethereum-nginx-proxy:latest`

And run a container with your custom `nginx.conf`:  
`docker run -p 8080:8080 -v /my/nginx.conf:/etc/nginx.conf antoine/ethereum-nginx-proxy:latest`

This image is based on Nginx 1.11.7, Lua Nginx module 0.10.7 and Lua CJSON 2.1.0.

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